Changeset 11342:3a8eb18b522f

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gpu: parametrize Wavefront size

Eliminate VSZ constant that defined the Wavefront size in numbers of work

items. Replaced it with a parameter in the GPU.py configuration script.

Changed all data structures dependent on the Wavefront size to be

dynamically sized.

Legal values of Wavefront size are 16, 32, 64 for now and checked at

initialization time.
Updated the patch so that it builds with latest version of Gem5.